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Discussion Starter #1
02 sts

It says speed limited to 90 on my dash.. what does this mean..
How do I over ride it
and is this why it wont shift into overdrive?
 

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1998 Cadillac Seville STS
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That message usually has something to do with the suspension control module (at least on my 1998). I get it about once every 6 months, then when I turn the car off and restart it, it is gone. I'll leave it to the more knowledgeable folks to comment on what exactly might be wrong.
 

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98 DeVille, 97 DeVille d'Elegance
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Pull the codes as per sticky ^^^ at top of forum and post code with definitions.
 

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Master of the Dark Art of Diagnostics
2003 DHS - two-2002 DHS, 2003 SLS, 1995 Sedan DeVille, 1989 Coupe DeVille
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02 sts

It says speed limited to 90 on my dash.. what does this mean..
How do I over ride it
and is this why it wont shift into overdrive?
--------------------------
It says speed limited to 90 on my dash.. what does this mean..
that means there is a problem somewhere -
probably with the suspension system -
so to protect you - the car's computer will shut off the fuel supply -
if you go over 90 MPH -

How do I over ride it
you don't simply "over ride" the problem - you fix it -
after - of course - you diagnose what the problem is -

is this why it wont shift into overdrive?
NO - but not shifting into overdrive could be the cause of the warning message -
how do you know it doesn't shift into 4th gear -

the first step is to check for Diagnostic Trouble Codes -

if you don't know how - go here and read the ENTIRE post -

http://www.cadillacforums.com/forums/cadillac-deville-1985-2005-including-1985/138257-how-pull-codes-dtcs.html

if you have any codes - post them here -
ALONG WITH THEIR DEFINITIONS -
 

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Discussion Starter #5
Pcm codes are as follows I dont know if anyone know where I can get a service manual for this thing... basically something to tell me what the part corresponds for what codes

Powertrain control module
p1811 maximum adapt and long shift... This seems to be the most menacing of all my problems right now... what would fix this?

p 0502 vehicle speed sensor vss low input
I have a part for this ac delco part 24230352.
but where is it located?

p0410 secondary air injection system
have a part number for this and a parts car...
but where is it at?212553
 

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'98 STS (RIP @ 206,xxx miles)
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White Diamond '03 DHS (with DTS floor shift)
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p 0502 vehicle speed sensor vss low input
I have a part for this ac delco part 24230352.
but where is it located?
The VSS is located on the right transmission output shaft (axle) housing (#130). It's accessible through the wheel well.




p0410 secondary air injection system
have a part number for this and a parts car...
but where is it at?212553
Not sure what part that is, but the AIR pump is behind the front fender in front of the wheel. You need to pull the front wheel well housing and the lower splash shield, unless that's one of the check valves under the hood.

http://parts.nalleygmc.com/showAssembly.aspx?ukey_assembly=386555&ukey_make=1023&ukey_model=14474&modelYear=2002&ukey_category=19400&ukey_trimLevel=15429


http://parts.nalleygmc.com/showAssembly.aspx?ukey_assembly=386480&ukey_make=1023&ukey_model=14474&modelYear=2002&ukey_category=19400&ukey_trimLevel=15429
 
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